Wärtsilä’s Vessel Internal Electrostatic Coalescer (VIEC) is a technology for enhancing liquid-liquid separation by using alternating high voltage electrical fields.
The modular construction consists of several electrodes, where each electrode is electrically insulated and has its own dedicated transformer for transforming a low voltage feed to high voltage.
It tolerates 100% water and 100% gas without short circuiting or arcing, making it ideally suited for use in any three-phase separator to speed up the separation of water dispersed in oil and/or to resolve stable oil-continuous emulsions.
The VIEC can be installed in new separators or retrofitted into existing three-phase separators with no hot work required.
Pairs of energized electrodes are supplied by a low voltage feed from dedicated external VIEC frequency cards, giving excellent reliability and robustness.
The VIEC system consists of the following building blocks:
The VIEC cassettes are stacked side by side to form a regular matrix of electrodes covering the oil-continuous layer inside the separator, which is normally from the normal interface level to the normal liquid level (see below illustration). One or more walls of elements can be installed, depending on the process conditions and requirements.
The main technical specifications are:
See technical data sheet for other specifications.
The VIEC® technology offers a wide range of applications for optimizing and/or de-bottlenecking oil separation trains, depending on the process scenarios and client requirements. Typical applications include the following:
The enhanced separation efficiency provided by VIEC electrostatic coalescence can offer several benefits with respect to both CAPEX and OPEX. These include one or several of the following:
Additional operational benefits include:
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Wärtsilä is a global leader in advanced technologies and complete lifecycle solutions for the marine and energy markets. By emphasising sustainable innovation and total efficiency, Wärtsilä maximises the environmental and economic performance of the vessels and power plants of its customers.